Types of inorganic reactions. Five most important types of reactions.

1. HAFEEZ ULLAH
BS CHEMISTRY 6th SEMESTER
GOVT POSTGRADUATE SCIENCE COLLEGE QUETTA
CLASS PRESENTATION
TOPICE:- TYPES OF CHEMICAL REACTIONS
( INORGANIC CHEMISTRY)

3. TYPES OF CHEMICAL RACTIONS
• There are five types of chemical reactions
1. Combination Reactions.
2. Decomposition Reactions.
3. Single-Replacement Reactions.
4. Double-Replacement Reactions.
5. Combustion Reaction.

4. 01:- Combination Reactions.
• It is also referred to as a synthesis reaction.
• It is a chemical change in which two or more substances react to form a new
singular substance.
• The product is a compound in this form of reaction.
• You can tell this reaction has occurred because on the reactant side there are
multiple substances, while on the product side there is only one product.

5. • One example of a synthesis reaction is the combination of iron and sulfur to
form iron (II) sulfide:
• 8 Fe + S8 ---> 8 FeS

6. 02- Decomposition reactions
• DESCRIPTION:
• Decomposition reactions are opposite of synthesis reactions. They occur
when a compound breaks up into simpler compounds
• AB ---> A + B
• GENERAL FORMULA:
• • Product ---> reactant + reactant
• AB ---> A + B

7. • This type of reaction is easily identifiable, because It is the exact opposite of
synthesis.
• There is always one reactant.
• One example of a decomposition reaction is the electrolysis of water to make
oxygen and hydrogen gas.
• 2 H2O ---> 2 H2 + O2
• Nitroglycerin, which can be activated merely by shaking, decomposes as
follows:
• 4C3H5(NO3)3 → 6N2 (g) + 12CO2(g) + 10H20(g) + O2

8. 03- Single-Replacement Reactions
• DISCRIPTON
• This reaction occur when one element is replaces with another element in a
compound.
• These reactions come in the general form of:
• A + BC ---> AC + B
• A chemical change where one element replaces a second element in a compound.
• •It is identifiable by its symmetry. On the reactant side there is a single element and a
compound, as there is on the product side.

9. • EXAMPLE
• One example of a single displacement reaction is when magnesium replaces
hydrogen in water to make magnesium hydroxide and hydrogen gas:
• Mg + 2 H2O ---> Mg(OH)2 + H2
• Na + KCl → K + NaCl
• F2 + LiCl → LiF + Cl2

10. 04- Double-Replacement Reactions
• DISCRIPTON
• Double Replacement Reactions occur when a metal replaces a metal in a
compound and a nonmetal replaces a nonmetal in a compound forming two
NEW COMPOUNDS
• AB + CD → CB + AD

11. Continue….
• This is when the anions and cations of two different molecules switch places,
forming two entirely different compounds.
• A chemical change where there is an exchange of positive ions between two
compounds.
• Often produce a precipitate, a gas, or a molecular compound
• Generally take place in aqueous solution.
• GENERAL FORMULA:
• compound + compound → compound + compound
AB + CD → AD + CB

12. • EXAMPLES:
• One example of a double displacement reaction is the reaction of lead (II)
nitrate with potassium iodide to form lead (II) iodide and potassium nitrate:
• Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3
• 3 NaOH + FeCl3 → (the positive ions change places)
• 3 NaOH + FeCl3 → Fe + 3(OH) +3Na + 3Cl¯
• 3 NaOH + FeCl3 → Fe (OH) 3 +3 NaCl

13. 5- Combustion Reaction
• DISCRIPTON
• Combustion reactions occur when a hydrocarbon reacts with oxygen gas to
produce carbon dioxide and water.
OR
• A combustion reaction is when oxygen combines with another compound to
form water and carbon dioxide. These reactions are exothermic, meaning
they produce heat.
• A chemical change where an element or a compound reacts with oxygen.
• This will often yield energy in the form of heat and light.

14. • GENERAL FORMULA:
CxHy + O2 → CO2 + H2O
• EXAMPLES:
• An example of this kind of reaction is the burning of naphthalene:
• C10H8 + 12 O2 ---> 10 CO2 + 4 H2O

15. Thank you for your attention